A Spread is the name given to the difference between the Bid and Ask price. i.e. the prices at which you as a client can Sell and Buy, respectively.
XM has several liquidity providers where they are sending the orders from traders to, and these liquidity providers(banks) are providing XM with the liquidity and prices(also there is bid ask spread).
As XM is a NDD broker, the broker mainly earns profits from the spread which traders are paying.
Meaning that the bid-ask price you are seeing in XM MT4 chart are, the prices(liquidity) which is provided by the LPs with mark-up spread added by XM.
Although XM does add mark-up spread, widened spread which is sometimes monitored in the market is not caused by the broker but from these liquidity providers.
‘Spread’ conditions on XM MT4 and MT5
XM offers 3 different account types of MT4 and MT5 platforms.
Micro and Standard accounts offer spread as low as 1 pip.
Zero Spread account offers spread as low as 0.0 pip but it charges 5 dollars per 1 lot as commission.
Floating Spread for all accounts
XM offers only floating/variable spread on all trading platforms and all account types.
This condition allows traders to benefit from lower spread as possible.
XM’s zero spread is possible with some of the major currency pairs with this floating/variable spread.
You can find an account types comparison table in the page here.
You can also visit XM Official Website for the latest and more information.
Spread could be widened in certain situations
Although the spread is very tight on XM’s MT4 and MT5 platforms, but it could be widened in certain situations.
The situation maybe during news releases, market holidays and other circumstances that can cause higher volatility to market prices.
Spread being widened is a common thing in any financial markets if the market is provided with natural supply and demand.
To be prepared for such situation and to avoid stop-out, you are recommended to have enough margin to support your positions at anytime.